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<p>[QUOTE=&quot;desertgem, post: 1258978, member: 15199&quot;]Much of the older ink was ferrous sulfate and tannin from gall nuts. As this ink, especially in higher humidity., breaks down the cellulose of the paper and produced the structural damage. Many handwritten diaries , manuscripts, etc. with such ink are being further damaged if not sealed in an inert gas or vacuum, or at least keeping with low moisture. But too low moisture will break down the paper also....... The ink can be neutralized by archivists, but color change and other secondary damage can occur. Just keep it in the PMG holder.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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